HEMATURIA - Stanford Medicine
Hematuria
Introduction
Hematuria is a common finding in children. Defined by the presence of an abnormal quantity of red blood cells (RBCs) in the urine, with hematuria being either visible to naked eye (gross) or apparent only upon urinalysis (microscopic).
American Academy of Pediatrics: Recommendations for Preventive Pediatric Health Care (2000)
Screening urinalysis at 5 years of age and once during adolescence
|Warning Signs |[pic] |
|Hematuria is worrisome when accompanied by: (will need bigger | |
|workup) | |
|Gross hematuria | |
|Hypertension | |
|Proteinuria | |
|Elevated serum creatinine | |
Macroscopic: Pink, red, cola colored
Microscopic: Seen only under microscope
• Dipstick – Reagent strip hydrogen peroxide catalyzes chemical reaction between hemoglobin (or myoglobin) and the chromogen tetramethylbenzidine.
• Detects 5-10 RBC/microliter (or 2-5 RBCs/HPF)
• False negatives in presence of formalin or high urinary concentration of ascorbic acid.
• False positive with alkaline urine (pH>9) or contamination with oxidizing agents used to clean the perineum.
[pic]
|[pic] |[pic] |
Glomerular Hematuria
Often associated with other abnormalities - red cell casts, proteinuria, edema, hypertension, and renal insufficiency.
Disorders that account for most cases of persistent isolated hematuria due to glomerular disease:
• IgA nephropathy – gross hematuria common, usu negative family history
• Hereditary nephritis (Alport syndrome) – gross hematuria common, some cases deafness
• Thin basement membrane nephropathy (benign familial hematuria) – gross hematuria uncommon ( ................
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